Knockdown box



Nrrnn TA'rEs CHARLES L. LOCKWOOD, OF PHILADELPHIA, PENNSYLVANIA.

KNOCKDOWN BOX.

SPECIFICATION forming part of Letters Patent No. 382,312, dated May 8, 1888.`

Application filed March 3, 188B.

To @ZZ whom it may concern:

Be it known that I, CHARLEs L. LooxwooD, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania,have invented a certain new and useful Improvement in Knockdown Boxes, of which the followingis aspecification. y

My invention relates to that class of boxes technically known as knookdown boxesg and'it consists in constructing the said boxes from naps having slots and tongues, as fully set forth hereinafter, and as illustrated in the accompanying drawings, in which- Figure l is an end view of the blank from which my improved box is made. Fig. 2 shows one corner with the parts in position to interlock the sides together prior to introducing the tongues into the slots. Fig. 3 shows the positions of the parts when the tongues are partially introduced into the slots. Fig. 4 shows the positions of the parts when the tongues are wholly introduced into the slots. Fig. 5 is a perspective view of the box with the sides locked together.

A box-blank is cut from an oblong sheet of board, and each corner is formed to the shape illustrated in Fig. 1, where is shown a slit, c, at right angles to one of the edges b of the box, extending into the blank a distance equal to the depth ofthe side and parallel to the adjacent edge o at a distance therefrom also equal to the depth ofthe side of the box. The loose piece f between the slit a and the edge c is cut to form two tongues, d e, each having a curved edge, w, and an inner shoulder, y, both of said tongues projecting outward toward the edge c parallel to the slit a. On the opposite side ofthe slit a,and between the edge b and a line, w, parallel thereto, which is scored or creased to divide the side from the bottom of the box, are formed two slots, g h, the former nearly parallel or parallel to the edge b and the other atan angle thereto. After the blank is thus formed with a flap and pair of tongues and two slots adjacent to each corner, the same is bent upon the scored lines w,and also upon scored lines w parallel to the edge c, thereby turning up the edges ofthe blank to form the sides jj k k.

The iiapsf at the ends ofthe side portions Serial No. 266,088. (No model.)

k k' are brought to the outsides of the side portions j j', as shown in Fig. 2, and the ap f at each corner is then pressed downward to bring the end ofthe tongue e into position to enter the slot g, and the tongue el is bent inward so as to enter the slot h, as shown in Fig. 3, after which the flap is pressed upward to carry the tongues fullyinto the slots tothe position shown in Fig. 4, when the sides of the box will be locked together at right angles to the bottom n. Y

By arranging the upper slot parallel to the adjacent y.ledge of the side portion the edge or shoulder y of the 4tongue e is brought at right angles to the said slot, and any pressure against the side lc of the box in the direction of the arrow, Fig. 4, will serve only to carry the said shoulder y firmly into the end of the slot without any tendency to unlock the ap f.

The tongue d serves to prevent the iiap f from being readily moved downward in the direction ofthe arrow, Fig. 5,and as this tongue d is at' the corner ofthe flap it can readily be bent upon the line o o, Fig. 3. so as to enter readily the inclined slot h, while the shoulder y of the tongue e will take its bearing against the end of the slot 7i and aid'in locking the ilap so as to resist any pressure on the side lc in the direction of the arrow, Fig. 4.

If the slot 7L were parallel to the slot y, the

lower tongue would not serve in any way tolook the upper one,and if the slot lz were placed at a higher point to receive a tongue above the corner of the flap, or at a lower pointso as to `receive a downwardly-projecting tongue, the latter would have to be bent to such an extent as to endanger the breaking of the material. By arranging the slothl at an angle, as describcd,and by placing the tongue d, projecting upward, at the extreme corner of the flap, I

am enabled to bend it so as to enter the lower slot without danger of breaking the material, and it serves very effectively to secure the upper tongue in place under ordinary pressures tending to throw it out.

I claiml. A blank for knockdown' boxes, creased upon the lines w w parallel to the edges, slotted from opposite sides alongthe lines w to the lines w to form iiaps f, with outwardly-projecting tongues e d at the end of each flap,

Ido

and with slots g h adjacent to each slit, the having at the outer ends vtwo upwardly-pro- 1o slot g being parallel to the outer edge and the jecting tongues, e d, substantially as set forth. slot h at an angle thereto, substantially as set In testimon7 whereofIhave signed my name forth. to this specification in the presence of two sub- 2. A knockdown paper box having in opposcribing witnesses. site sides slots g adjacent and parallel to the CHARLES L. LOCKWOOD. edge of such sides, and slots h, each at an an- Witnesses: gle to the adjacent slot g, and with terminal RIOHD. H. REILLY, iiaps f on the other sides of the box, each flap F. L. FREEMAN. 

